The font looks like Terminus. The background transparency effect and hidden scrollbars can be set-up with most terminals, this one is probably urxvt. As for the borderless/undecorated window, that's probably done via the Window Manager. DWM[0] for example doesn't paint window decorations but there's usually a way to set this up in Gnome/Unity/KDE/etc as well.
[0] http://dwm.suckless.org